Resistance devices, electrical, permanent, non-wire. Methods of tests
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Fixed non-wire wound resistors. Methods of tests
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Broadcast receivers based on lamps. Acoustic test methods
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Broadcast receivers based on lamps. Electric test methods
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Carbon microphone powders. Methods of tests
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Telephones. Methods of electroacoustic tests
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Laringophones with coal. Methods of electroacoustic tests
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General purpose microphones. Methods of electroacoustic tests
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General purpose telephone sets. Methods of tests
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General purpose telephone sets. Methods of tests
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Microphones (except for carbon ones) and loudspeakers. Methods of electroacoustic tests
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Microphones and loudspeakers. Methods of electroacoustic tests
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